[julia-users] Why do bools have functions like abs and sign defined?

[Dan Luu]

In bool.jl, there are things like

signbit(x::Bool) = false
sign(x::Bool) = x
abs(x::Bool) = x
abs2(x::Bool) = x

Are these because Bool is a subtype of something where you'd expect
these to be defined, or are these useful in their own right, and if
so, when would you use these?


Thanks,
Dan